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linux/drivers/net/phy/intel-xway.c
Martin Schiller be393dd685 net: phy: intel-xway: Add RGMII internal delay configuration 
This adds the possibility to configure the RGMII RX/TX clock skew via
devicetree.

Simply set phy mode to "rgmii-id", "rgmii-rxid" or "rgmii-txid" and add
the "rx-internal-delay-ps" or "tx-internal-delay-ps" property to the
devicetree.

Furthermore, a warning is now issued if the phy mode is configured to
"rgmii" and an internal delay is set in the phy (e.g. by pin-strapping),
as in the dp83867 driver.

Signed-off-by: Martin Schiller <ms@dev.tdt.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-07-20 07:23:16 -07:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2012 Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
* Copyright (C) 2016 Hauke Mehrtens <hauke@hauke-m.de>
*/
#include <linux/mdio.h>
#include <linux/module.h>
#include <linux/phy.h>
#include <linux/of.h>
#include <linux/bitfield.h>
#define XWAY_MDIO_MIICTRL 0x17 /* mii control */
#define XWAY_MDIO_IMASK 0x19 /* interrupt mask */
#define XWAY_MDIO_ISTAT 0x1A /* interrupt status */
#define XWAY_MDIO_LED 0x1B /* led control */
#define XWAY_MDIO_MIICTRL_RXSKEW_MASK GENMASK(14, 12)
#define XWAY_MDIO_MIICTRL_TXSKEW_MASK GENMASK(10, 8)
/* bit 15:12 are reserved */
#define XWAY_MDIO_LED_LED3_EN BIT(11) /* Enable the integrated function of LED3 */
#define XWAY_MDIO_LED_LED2_EN BIT(10) /* Enable the integrated function of LED2 */
#define XWAY_MDIO_LED_LED1_EN BIT(9) /* Enable the integrated function of LED1 */
#define XWAY_MDIO_LED_LED0_EN BIT(8) /* Enable the integrated function of LED0 */
/* bit 7:4 are reserved */
#define XWAY_MDIO_LED_LED3_DA BIT(3) /* Direct Access to LED3 */
#define XWAY_MDIO_LED_LED2_DA BIT(2) /* Direct Access to LED2 */
#define XWAY_MDIO_LED_LED1_DA BIT(1) /* Direct Access to LED1 */
#define XWAY_MDIO_LED_LED0_DA BIT(0) /* Direct Access to LED0 */
#define XWAY_MDIO_INIT_WOL BIT(15) /* Wake-On-LAN */
#define XWAY_MDIO_INIT_MSRE BIT(14)
#define XWAY_MDIO_INIT_NPRX BIT(13)
#define XWAY_MDIO_INIT_NPTX BIT(12)
#define XWAY_MDIO_INIT_ANE BIT(11) /* Auto-Neg error */
#define XWAY_MDIO_INIT_ANC BIT(10) /* Auto-Neg complete */
#define XWAY_MDIO_INIT_ADSC BIT(5) /* Link auto-downspeed detect */
#define XWAY_MDIO_INIT_MPIPC BIT(4)
#define XWAY_MDIO_INIT_MDIXC BIT(3)
#define XWAY_MDIO_INIT_DXMC BIT(2) /* Duplex mode change */
#define XWAY_MDIO_INIT_LSPC BIT(1) /* Link speed change */
#define XWAY_MDIO_INIT_LSTC BIT(0) /* Link state change */
#define XWAY_MDIO_INIT_MASK (XWAY_MDIO_INIT_LSTC | \
XWAY_MDIO_INIT_ADSC)
#define ADVERTISED_MPD BIT(10) /* Multi-port device */
/* LED Configuration */
#define XWAY_MMD_LEDCH 0x01E0
/* Inverse of SCAN Function */
#define XWAY_MMD_LEDCH_NACS_NONE 0x0000
#define XWAY_MMD_LEDCH_NACS_LINK 0x0001
#define XWAY_MMD_LEDCH_NACS_PDOWN 0x0002
#define XWAY_MMD_LEDCH_NACS_EEE 0x0003
#define XWAY_MMD_LEDCH_NACS_ANEG 0x0004
#define XWAY_MMD_LEDCH_NACS_ABIST 0x0005
#define XWAY_MMD_LEDCH_NACS_CDIAG 0x0006
#define XWAY_MMD_LEDCH_NACS_TEST 0x0007
/* Slow Blink Frequency */
#define XWAY_MMD_LEDCH_SBF_F02HZ 0x0000
#define XWAY_MMD_LEDCH_SBF_F04HZ 0x0010
#define XWAY_MMD_LEDCH_SBF_F08HZ 0x0020
#define XWAY_MMD_LEDCH_SBF_F16HZ 0x0030
/* Fast Blink Frequency */
#define XWAY_MMD_LEDCH_FBF_F02HZ 0x0000
#define XWAY_MMD_LEDCH_FBF_F04HZ 0x0040
#define XWAY_MMD_LEDCH_FBF_F08HZ 0x0080
#define XWAY_MMD_LEDCH_FBF_F16HZ 0x00C0
/* LED Configuration */
#define XWAY_MMD_LEDCL 0x01E1
/* Complex Blinking Configuration */
#define XWAY_MMD_LEDCH_CBLINK_NONE 0x0000
#define XWAY_MMD_LEDCH_CBLINK_LINK 0x0001
#define XWAY_MMD_LEDCH_CBLINK_PDOWN 0x0002
#define XWAY_MMD_LEDCH_CBLINK_EEE 0x0003
#define XWAY_MMD_LEDCH_CBLINK_ANEG 0x0004
#define XWAY_MMD_LEDCH_CBLINK_ABIST 0x0005
#define XWAY_MMD_LEDCH_CBLINK_CDIAG 0x0006
#define XWAY_MMD_LEDCH_CBLINK_TEST 0x0007
/* Complex SCAN Configuration */
#define XWAY_MMD_LEDCH_SCAN_NONE 0x0000
#define XWAY_MMD_LEDCH_SCAN_LINK 0x0010
#define XWAY_MMD_LEDCH_SCAN_PDOWN 0x0020
#define XWAY_MMD_LEDCH_SCAN_EEE 0x0030
#define XWAY_MMD_LEDCH_SCAN_ANEG 0x0040
#define XWAY_MMD_LEDCH_SCAN_ABIST 0x0050
#define XWAY_MMD_LEDCH_SCAN_CDIAG 0x0060
#define XWAY_MMD_LEDCH_SCAN_TEST 0x0070
/* Configuration for LED Pin x */
#define XWAY_MMD_LED0H 0x01E2
/* Fast Blinking Configuration */
#define XWAY_MMD_LEDxH_BLINKF_MASK 0x000F
#define XWAY_MMD_LEDxH_BLINKF_NONE 0x0000
#define XWAY_MMD_LEDxH_BLINKF_LINK10 0x0001
#define XWAY_MMD_LEDxH_BLINKF_LINK100 0x0002
#define XWAY_MMD_LEDxH_BLINKF_LINK10X 0x0003
#define XWAY_MMD_LEDxH_BLINKF_LINK1000 0x0004
#define XWAY_MMD_LEDxH_BLINKF_LINK10_0 0x0005
#define XWAY_MMD_LEDxH_BLINKF_LINK100X 0x0006
#define XWAY_MMD_LEDxH_BLINKF_LINK10XX 0x0007
#define XWAY_MMD_LEDxH_BLINKF_PDOWN 0x0008
#define XWAY_MMD_LEDxH_BLINKF_EEE 0x0009
#define XWAY_MMD_LEDxH_BLINKF_ANEG 0x000A
#define XWAY_MMD_LEDxH_BLINKF_ABIST 0x000B
#define XWAY_MMD_LEDxH_BLINKF_CDIAG 0x000C
/* Constant On Configuration */
#define XWAY_MMD_LEDxH_CON_MASK 0x00F0
#define XWAY_MMD_LEDxH_CON_NONE 0x0000
#define XWAY_MMD_LEDxH_CON_LINK10 0x0010
#define XWAY_MMD_LEDxH_CON_LINK100 0x0020
#define XWAY_MMD_LEDxH_CON_LINK10X 0x0030
#define XWAY_MMD_LEDxH_CON_LINK1000 0x0040
#define XWAY_MMD_LEDxH_CON_LINK10_0 0x0050
#define XWAY_MMD_LEDxH_CON_LINK100X 0x0060
#define XWAY_MMD_LEDxH_CON_LINK10XX 0x0070
#define XWAY_MMD_LEDxH_CON_PDOWN 0x0080
#define XWAY_MMD_LEDxH_CON_EEE 0x0090
#define XWAY_MMD_LEDxH_CON_ANEG 0x00A0
#define XWAY_MMD_LEDxH_CON_ABIST 0x00B0
#define XWAY_MMD_LEDxH_CON_CDIAG 0x00C0
#define XWAY_MMD_LEDxH_CON_COPPER 0x00D0
#define XWAY_MMD_LEDxH_CON_FIBER 0x00E0
/* Configuration for LED Pin x */
#define XWAY_MMD_LED0L 0x01E3
/* Pulsing Configuration */
#define XWAY_MMD_LEDxL_PULSE_MASK 0x000F
#define XWAY_MMD_LEDxL_PULSE_NONE 0x0000
#define XWAY_MMD_LEDxL_PULSE_TXACT 0x0001
#define XWAY_MMD_LEDxL_PULSE_RXACT 0x0002
#define XWAY_MMD_LEDxL_PULSE_COL 0x0004
/* Slow Blinking Configuration */
#define XWAY_MMD_LEDxL_BLINKS_MASK 0x00F0
#define XWAY_MMD_LEDxL_BLINKS_NONE 0x0000
#define XWAY_MMD_LEDxL_BLINKS_LINK10 0x0010
#define XWAY_MMD_LEDxL_BLINKS_LINK100 0x0020
#define XWAY_MMD_LEDxL_BLINKS_LINK10X 0x0030
#define XWAY_MMD_LEDxL_BLINKS_LINK1000 0x0040
#define XWAY_MMD_LEDxL_BLINKS_LINK10_0 0x0050
#define XWAY_MMD_LEDxL_BLINKS_LINK100X 0x0060
#define XWAY_MMD_LEDxL_BLINKS_LINK10XX 0x0070
#define XWAY_MMD_LEDxL_BLINKS_PDOWN 0x0080
#define XWAY_MMD_LEDxL_BLINKS_EEE 0x0090
#define XWAY_MMD_LEDxL_BLINKS_ANEG 0x00A0
#define XWAY_MMD_LEDxL_BLINKS_ABIST 0x00B0
#define XWAY_MMD_LEDxL_BLINKS_CDIAG 0x00C0
#define XWAY_MMD_LED1H 0x01E4
#define XWAY_MMD_LED1L 0x01E5
#define XWAY_MMD_LED2H 0x01E6
#define XWAY_MMD_LED2L 0x01E7
#define XWAY_MMD_LED3H 0x01E8
#define XWAY_MMD_LED3L 0x01E9
#define PHY_ID_PHY11G_1_3 0x030260D1
#define PHY_ID_PHY22F_1_3 0x030260E1
#define PHY_ID_PHY11G_1_4 0xD565A400
#define PHY_ID_PHY22F_1_4 0xD565A410
#define PHY_ID_PHY11G_1_5 0xD565A401
#define PHY_ID_PHY22F_1_5 0xD565A411
#define PHY_ID_PHY11G_VR9_1_1 0xD565A408
#define PHY_ID_PHY22F_VR9_1_1 0xD565A418
#define PHY_ID_PHY11G_VR9_1_2 0xD565A409
#define PHY_ID_PHY22F_VR9_1_2 0xD565A419
static const int xway_internal_delay[] = {0, 500, 1000, 1500, 2000, 2500,
3000, 3500};
static int xway_gphy_rgmii_init(struct phy_device *phydev)
{
struct device *dev = &phydev->mdio.dev;
unsigned int delay_size = ARRAY_SIZE(xway_internal_delay);
s32 int_delay;
int val = 0;
if (!phy_interface_is_rgmii(phydev))
return 0;
/* Existing behavior was to use default pin strapping delay in rgmii
* mode, but rgmii should have meant no delay. Warn existing users,
* but do not change anything at the moment.
*/
if (phydev->interface == PHY_INTERFACE_MODE_RGMII) {
u16 txskew, rxskew;
val = phy_read(phydev, XWAY_MDIO_MIICTRL);
if (val < 0)
return val;
txskew = FIELD_GET(XWAY_MDIO_MIICTRL_TXSKEW_MASK, val);
rxskew = FIELD_GET(XWAY_MDIO_MIICTRL_RXSKEW_MASK, val);
if (txskew > 0 || rxskew > 0)
phydev_warn(phydev,
"PHY has delays (e.g. via pin strapping), but phy-mode = 'rgmii'\n"
"Should be 'rgmii-id' to use internal delays txskew:%d ps rxskew:%d ps\n",
xway_internal_delay[txskew],
xway_internal_delay[rxskew]);
return 0;
}
if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) {
int_delay = phy_get_internal_delay(phydev, dev,
xway_internal_delay,
delay_size, true);
/* if rx-internal-delay-ps is missing, use default of 2.0 ns */
if (int_delay < 0)
int_delay = 4; /* 2000 ps */
val |= FIELD_PREP(XWAY_MDIO_MIICTRL_RXSKEW_MASK, int_delay);
}
if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID) {
int_delay = phy_get_internal_delay(phydev, dev,
xway_internal_delay,
delay_size, false);
/* if tx-internal-delay-ps is missing, use default of 2.0 ns */
if (int_delay < 0)
int_delay = 4; /* 2000 ps */
val |= FIELD_PREP(XWAY_MDIO_MIICTRL_TXSKEW_MASK, int_delay);
}
return phy_modify(phydev, XWAY_MDIO_MIICTRL,
XWAY_MDIO_MIICTRL_RXSKEW_MASK |
XWAY_MDIO_MIICTRL_TXSKEW_MASK, val);
}
static int xway_gphy_config_init(struct phy_device *phydev)
{
int err;
u32 ledxh;
u32 ledxl;
/* Mask all interrupts */
err = phy_write(phydev, XWAY_MDIO_IMASK, 0);
if (err)
return err;
/* Clear all pending interrupts */
phy_read(phydev, XWAY_MDIO_ISTAT);
/* Ensure that integrated led function is enabled for all leds */
err = phy_write(phydev, XWAY_MDIO_LED,
XWAY_MDIO_LED_LED0_EN |
XWAY_MDIO_LED_LED1_EN |
XWAY_MDIO_LED_LED2_EN |
XWAY_MDIO_LED_LED3_EN);
if (err)
return err;
phy_write_mmd(phydev, MDIO_MMD_VEND2, XWAY_MMD_LEDCH,
XWAY_MMD_LEDCH_NACS_NONE |
XWAY_MMD_LEDCH_SBF_F02HZ |
XWAY_MMD_LEDCH_FBF_F16HZ);
phy_write_mmd(phydev, MDIO_MMD_VEND2, XWAY_MMD_LEDCL,
XWAY_MMD_LEDCH_CBLINK_NONE |
XWAY_MMD_LEDCH_SCAN_NONE);
/**
* In most cases only one LED is connected to this phy, so
* configure them all to constant on and pulse mode. LED3 is
* only available in some packages, leave it in its reset
* configuration.
*/
ledxh = XWAY_MMD_LEDxH_BLINKF_NONE | XWAY_MMD_LEDxH_CON_LINK10XX;
ledxl = XWAY_MMD_LEDxL_PULSE_TXACT | XWAY_MMD_LEDxL_PULSE_RXACT |
XWAY_MMD_LEDxL_BLINKS_NONE;
phy_write_mmd(phydev, MDIO_MMD_VEND2, XWAY_MMD_LED0H, ledxh);
phy_write_mmd(phydev, MDIO_MMD_VEND2, XWAY_MMD_LED0L, ledxl);
phy_write_mmd(phydev, MDIO_MMD_VEND2, XWAY_MMD_LED1H, ledxh);
phy_write_mmd(phydev, MDIO_MMD_VEND2, XWAY_MMD_LED1L, ledxl);
phy_write_mmd(phydev, MDIO_MMD_VEND2, XWAY_MMD_LED2H, ledxh);
phy_write_mmd(phydev, MDIO_MMD_VEND2, XWAY_MMD_LED2L, ledxl);
err = xway_gphy_rgmii_init(phydev);
if (err)
return err;
return 0;
}
static int xway_gphy14_config_aneg(struct phy_device *phydev)
{
int reg, err;
/* Advertise as multi-port device, see IEEE802.3-2002 40.5.1.1 */
/* This is a workaround for an errata in rev < 1.5 devices */
reg = phy_read(phydev, MII_CTRL1000);
reg |= ADVERTISED_MPD;
err = phy_write(phydev, MII_CTRL1000, reg);
if (err)
return err;
return genphy_config_aneg(phydev);
}
static int xway_gphy_ack_interrupt(struct phy_device *phydev)
{
int reg;
reg = phy_read(phydev, XWAY_MDIO_ISTAT);
return (reg < 0) ? reg : 0;
}
static int xway_gphy_config_intr(struct phy_device *phydev)
{
u16 mask = 0;
int err;
if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
err = xway_gphy_ack_interrupt(phydev);
if (err)
return err;
mask = XWAY_MDIO_INIT_MASK;
err = phy_write(phydev, XWAY_MDIO_IMASK, mask);
} else {
err = phy_write(phydev, XWAY_MDIO_IMASK, mask);
if (err)
return err;
err = xway_gphy_ack_interrupt(phydev);
}
return err;
}
static irqreturn_t xway_gphy_handle_interrupt(struct phy_device *phydev)
{
int irq_status;
irq_status = phy_read(phydev, XWAY_MDIO_ISTAT);
if (irq_status < 0) {
phy_error(phydev);
return IRQ_NONE;
}
if (!(irq_status & XWAY_MDIO_INIT_MASK))
return IRQ_NONE;
phy_trigger_machine(phydev);
return IRQ_HANDLED;
}
static struct phy_driver xway_gphy[] = {
{
.phy_id = PHY_ID_PHY11G_1_3,
.phy_id_mask = 0xffffffff,
.name = "Intel XWAY PHY11G (PEF 7071/PEF 7072) v1.3",
/* PHY_GBIT_FEATURES */
.config_init = xway_gphy_config_init,
.config_aneg = xway_gphy14_config_aneg,
.handle_interrupt = xway_gphy_handle_interrupt,
.config_intr = xway_gphy_config_intr,
.suspend = genphy_suspend,
.resume = genphy_resume,
}, {
.phy_id = PHY_ID_PHY22F_1_3,
.phy_id_mask = 0xffffffff,
.name = "Intel XWAY PHY22F (PEF 7061) v1.3",
/* PHY_BASIC_FEATURES */
.config_init = xway_gphy_config_init,
.config_aneg = xway_gphy14_config_aneg,
.handle_interrupt = xway_gphy_handle_interrupt,
.config_intr = xway_gphy_config_intr,
.suspend = genphy_suspend,
.resume = genphy_resume,
}, {
.phy_id = PHY_ID_PHY11G_1_4,
.phy_id_mask = 0xffffffff,
.name = "Intel XWAY PHY11G (PEF 7071/PEF 7072) v1.4",
/* PHY_GBIT_FEATURES */
.config_init = xway_gphy_config_init,
.config_aneg = xway_gphy14_config_aneg,
.handle_interrupt = xway_gphy_handle_interrupt,
.config_intr = xway_gphy_config_intr,
.suspend = genphy_suspend,
.resume = genphy_resume,
}, {
.phy_id = PHY_ID_PHY22F_1_4,
.phy_id_mask = 0xffffffff,
.name = "Intel XWAY PHY22F (PEF 7061) v1.4",
/* PHY_BASIC_FEATURES */
.config_init = xway_gphy_config_init,
.config_aneg = xway_gphy14_config_aneg,
.handle_interrupt = xway_gphy_handle_interrupt,
.config_intr = xway_gphy_config_intr,
.suspend = genphy_suspend,
.resume = genphy_resume,
}, {
.phy_id = PHY_ID_PHY11G_1_5,
.phy_id_mask = 0xffffffff,
.name = "Intel XWAY PHY11G (PEF 7071/PEF 7072) v1.5 / v1.6",
/* PHY_GBIT_FEATURES */
.config_init = xway_gphy_config_init,
.handle_interrupt = xway_gphy_handle_interrupt,
.config_intr = xway_gphy_config_intr,
.suspend = genphy_suspend,
.resume = genphy_resume,
}, {
.phy_id = PHY_ID_PHY22F_1_5,
.phy_id_mask = 0xffffffff,
.name = "Intel XWAY PHY22F (PEF 7061) v1.5 / v1.6",
/* PHY_BASIC_FEATURES */
.config_init = xway_gphy_config_init,
.handle_interrupt = xway_gphy_handle_interrupt,
.config_intr = xway_gphy_config_intr,
.suspend = genphy_suspend,
.resume = genphy_resume,
}, {
.phy_id = PHY_ID_PHY11G_VR9_1_1,
.phy_id_mask = 0xffffffff,
.name = "Intel XWAY PHY11G (xRX v1.1 integrated)",
/* PHY_GBIT_FEATURES */
.config_init = xway_gphy_config_init,
.handle_interrupt = xway_gphy_handle_interrupt,
.config_intr = xway_gphy_config_intr,
.suspend = genphy_suspend,
.resume = genphy_resume,
}, {
.phy_id = PHY_ID_PHY22F_VR9_1_1,
.phy_id_mask = 0xffffffff,
.name = "Intel XWAY PHY22F (xRX v1.1 integrated)",
/* PHY_BASIC_FEATURES */
.config_init = xway_gphy_config_init,
.handle_interrupt = xway_gphy_handle_interrupt,
.config_intr = xway_gphy_config_intr,
.suspend = genphy_suspend,
.resume = genphy_resume,
}, {
.phy_id = PHY_ID_PHY11G_VR9_1_2,
.phy_id_mask = 0xffffffff,
.name = "Intel XWAY PHY11G (xRX v1.2 integrated)",
/* PHY_GBIT_FEATURES */
.config_init = xway_gphy_config_init,
.handle_interrupt = xway_gphy_handle_interrupt,
.config_intr = xway_gphy_config_intr,
.suspend = genphy_suspend,
.resume = genphy_resume,
}, {
.phy_id = PHY_ID_PHY22F_VR9_1_2,
.phy_id_mask = 0xffffffff,
.name = "Intel XWAY PHY22F (xRX v1.2 integrated)",
/* PHY_BASIC_FEATURES */
.config_init = xway_gphy_config_init,
.handle_interrupt = xway_gphy_handle_interrupt,
.config_intr = xway_gphy_config_intr,
.suspend = genphy_suspend,
.resume = genphy_resume,
},
};
module_phy_driver(xway_gphy);
static struct mdio_device_id __maybe_unused xway_gphy_tbl[] = {
{ PHY_ID_PHY11G_1_3, 0xffffffff },
{ PHY_ID_PHY22F_1_3, 0xffffffff },
{ PHY_ID_PHY11G_1_4, 0xffffffff },
{ PHY_ID_PHY22F_1_4, 0xffffffff },
{ PHY_ID_PHY11G_1_5, 0xffffffff },
{ PHY_ID_PHY22F_1_5, 0xffffffff },
{ PHY_ID_PHY11G_VR9_1_1, 0xffffffff },
{ PHY_ID_PHY22F_VR9_1_1, 0xffffffff },
{ PHY_ID_PHY11G_VR9_1_2, 0xffffffff },
{ PHY_ID_PHY22F_VR9_1_2, 0xffffffff },
{ }
};
MODULE_DEVICE_TABLE(mdio, xway_gphy_tbl);
MODULE_DESCRIPTION("Intel XWAY PHY driver");
MODULE_LICENSE("GPL");
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